Home / 21,320.84-31,971.53-12,558.26

Finding the Fourth Proportional to 21,320.84, 31,971.53 and 12,558.26

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Solution

The fourth proportional to 21,320.84, 31,971.53 and 12,558.26 is: 18,831.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,320.84 : 31,971.53 = 12,558.26 : x
  2. Step 2: Convert to fraction form
    21,320.84/31,971.53 = 12,558.26/x
  3. Step 3: Cross multiply
    21,320.84x = 31,971.53 × 12,558.26
  4. Step 4: Simplify right side
    21,320.84x = 401,506,657.88
  5. Step 5: Solve for x
    x = 401,506,657.88/21,320.84
  6. Step 6: Final answer
    x = 18,831.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.